fix: restore data-testid="chat-interface" removed by #340 (#437)

* fix: restore data-testid="chat-interface" removed by #340

PR #340 added left padding to the ChatInterface wrapper div but
accidentally dropped the data-testid attribute in the same edit.
This broke both the collapsible-thinking snapshot tests and the live
e2e test, which both use getByTestId('chat-interface') as the load
signal and screenshot target.

Co-authored-by: openhands <openhands@all-hands.dev>

* chore: update baseline snapshots [skip ci]

* ci: trigger re-run after snapshot baseline update

---------

Co-authored-by: openhands <openhands@all-hands.dev>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -20,14 +20,8 @@ permissions:
 
 jobs:
   test-and-build:
-    name: Test and build (${{ matrix.os }})
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-24.04
     timeout-minutes: 20
-    strategy:
-      fail-fast: false
-      matrix:
-        os:
-          - ubuntu-24.04
 
     steps:
       - name: Check out repository